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??????????. ??????? An Introduction to Database System ??? ??????. ??? ??????. 6.1 ????? 6.2 ??? 6.3 ????????? * 6.4 ????? 6.5 ??. 6.1 ?????. ????????? ?????????????????????? ???????????????????????. ?????. ?????? ???????????? ????????? ??????????? ?????????????. ??????.

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1.32k views • 122 slides
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??????????. ??????? An Introduction to Database System ??? ??????. ??? ??????. 6.1 ????? 6.2 ??? 6.3 ????????? * 6.4 ????? 6.5 ??. 6.1 ?????. ????????? ?????????????????????? ???????????????????????. ?????. ?????? ???????????? ????????? ??????????? ?????????????. ??????.

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1.36k views • 121 slides
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??????????. ??????? An Introduction to Database System ??? ??????. ??? ??????. 6.1 ????? 6.2 ??? 6.3 ????????? * 6.4 ????? 6.5 ??. 6.1 ?????. ????????? ?????????????????????? ???????????????????????. ?????. ?????? ???????????? ????????? ??????????? ?????????????. ??????.

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1.41k views • 121 slides
??????? An Introduction to Database System ??? ??????

??????? An Introduction to Database System ??? ??????

??????? An Introduction to Database System ??? ??????. ??? ??????. 6.1 ????? 6.2 ??? 6.3 ????????? * 6.4 ???????? 6.5 ??. 6.1 ?????. ????????? ?????????????????????? ???????????????????????. ?????. ?????? ???????????? ????????? ??????????? ?????????????. ??????. ?? ????

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1.16k views • 103 slides
Relational Database Theory

Relational Database Theory

Relational Database Theory. Designing high quality tables. Remove redundancy! Decomposition! How can decomposition be no error ? How to determine the primary key?. Functional Dependency (1).

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750 views • 62 slides
Relational Database Theory

Relational Database Theory

Relational Database Theory. Designing high quality tables. Remove redundancy! Decomposition! How can decomposition be no error ? How to determine the primary key?. Functional Dependency (1).

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746 views • 62 slides
??????? An Introduction to Database System ??? ??????

??????? An Introduction to Database System ??? ??????

??????? An Introduction to Database System ??? ??????. 6.1 ????? 6.2 ??? 6.3 ????????? * 6.4 ????? 6.5 ??. ????????? ?????????????????????? ???????????????????????. 6.1 ?????. ?????? ???????????? ????????? ??????????? ?????????????. ?????. ?? ???? ????? ????????. ??????.

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492 views • 41 slides
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????. ????. ??? ?????? 5.1 ?????. ? ????? ?? ???????????? : R (U, D, dom, F) ?? : (1) ??? R; (2) ???? U; (3) ??? U ???????? D; (4) ??????? dom; (5) ??? U ???????? F. ?? (3),(4) ???????????????????????????? R <U, F>. ?? ???????.

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373 views • 21 slides
5.2.3 ??

5.2.3 ??

5.2.3 ??. ????????? ( ????? ) ????? ???? 1NF, 2NF, 3NF, BCNF, 4NF,5NF ??? ( ????? ) ????? 1NF ? 2NF ? 3NF ? BCNF ? 4NF ? 5NF ????????? R ???????? R ? x NF. 1NF(First Normal Form). ????? R ????????????????? R ?1NF ??? 1NF ?????????? ???

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447 views • 14 slides

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